Geometric instrument



T- I. AND WJ. SULLIVAN. GEOMETRI() INSTRUMENT. APPLICATION FILED MAY 25. 1922.

II, ISI. 5 Patented Nov. 2l, 1922.,

. TraF/YEY Fatented New.. 2i, M22.

. entre@ stares raras-r 'EEMGTHY SULLIVAN, OF HARTFORD, AND WELLIAM J'. SULLIVAN, 0T EAST i HARTFORD, GONNECTECUT.

' GEOMETRG NSTBUMEN'IL. .application filed lfay Q5, 1922. Serial No. /ie.

To all 'who/mit may concern: Fig. 11 is a section on the line 11-11of Be it known that we, TIMOTHY J. SULLI- Fig. 10.

VAN and WILLIAM d. SULLIVAN, citizens of Fig. 12 is a top plan view of a modificathe United States, residing at'l-lartford and tion:

e East Hartford, respectively, in the county Like fcharacters refer to -like parts 55 of Hartford and State of Connecticut, have throughout the several views of the drawinvented certain new and useful lmprovein ,these views being on different scales. 4 ments in Geometric instruments, of which he appliance involves in its make-up a the following is a specification. suitable foundation or base member which il@ This invention relates to a geometric inis intended to sustain the article upon which 60 strument, such for instance as is used by lines or the like are intended to be drawn. mechanical engineers, draftsmen, civil engi- This article may be of any proper nature. neers, architects and other individuals for For instance, it may be a book or series of the purpose, among others of scribing ansheets as 2 laid upon a base o-r foundation 15 gles of various degrees. member such as 3 which generallyconsists 65 Among the lobjects of the invention are of a practically rectangular piece of wood, the provision of an article of the character metal or composition material as desired set` forth which is' simple in construction, upon which the pad or book 2 is laid, the e'ective in actiofn and by reasono'f which base being .of a little larger area preferably the maximum accuracy in various kinds of than the pad or book 2 although this is not 70 work is insured. a vital consideration, nor is the shape of the ln the drawing accompanying and formrespective parts. ing part of the resent specication we have We prefer -to associate with the base or shown in detai several forms of embodifoundation 3, suitable bearing members such 15 ment of the invention which will be set forth as those designated in a general way respec- 75 fully in the following description. Obvitively by-fi, each bearing member involving ously, We are in no sense restricted to this in its make-up a body such as 5. Although specific disclosure. We may depart therethese bearing'members 4 maybe located in from in a number of respects within the any desirable place, they are desirably sitscope of the invention definedby the claims uated at the upper corners of the base or 80 following said description. foundation. Each body 5 is practically of Referring to said drawing: yoke form, its base being su1tably rigidly Fig. 1 is a top. plan .view of a geometric attached to the upper side of the base or instrument involvlng the invention, the foundation member, its transverse portion dotted lilies showing one of the parts inan extending perpendicularly or at rightan- 85 adjusted. position. gles to the base, and its upper branch being Fig. 2 is a side elevation of the same. 'practically in parallelism with the lower or 3 is a perspective view of the upper wider branch as shown in Fig. 1. rlhe main corner of the instrument. or transverse portions of lthe respective 40 Fig. 4 is a cross section on the line 4--4- bodies 5 may have associated with them on 9.0

c5 of Fig. 6.

Fig. 2.

of Fig. 1. their lforward or lower sides the strip 6 hav- Figs. 5 and 6 are transverse sections on ing a resilient flange 7 to overlie the pad or the lines 5--5 and 6-6 of Fig. 1. book 2. As shown the transverse portions Fig. 7 is a cross section on the line 7--7y of the bodies 5 have in themvertically elonl gated slots 5 to receive the screws 6 thread- 95 Fig. 8 is a detail View intop plan of a ed into thestrip. 6 to thus provide for adslight modicatio-n. f justability of said strip 6 and therefore of Fig. 9 is a sectional detail. the Yconnecting flange 7 to conform to the Fig. 10 is a section on the line 10-10 of thickness of the book or pad. The two p bearing members 4f constitute a convenient 10o means for sustaining a holding down or clamping member such as thatjdenoted in a' general way by 8 and which as we will herethereof fitting rabbets lnafter explain, yieldingly engages the upper sheet of the pad or book 2.

As shown there are disposed between the upper and the lower branches of the U- shaped bodies 5 the blocks 49 whlch have threaded through them, adjusting screws as l0 by which the blocks can be moved up or down or toward or from the bases of the U- shaped bodies 5, posts or pins as 11 extending freely through the respective blocks, supported by the bodies 5, and preventmg turning movement of the blocks 9. Throug these blocks extends the shaft 12, the outer ends of which project laterally from the respective blocks and receive upon their extended ends coiled springs as 13, the inner ends of which are desirably connected fixedly with the respective blocks' and the outer ends of which act against the heads 14 and through which extend the extreme outer ends of the shaft or spindle 12. As shown, these heads are at the upper ends of the side bars 15 of the yoke-like clamping member 8. These side bars may be rigid with the base or transverse portion 16 of said holding down or clamping member 8, the base or cross portion 16 which isl intended to bear against the lower portion of the uppermost sheet of the pad or book 2 is to facilitate its action, somewhat attened and roughened on its inner surface. The heads 14 have connected with them the respective springs 13 so that the springs can apply their effect to the holdmg down or clamping member 8.

Extending between the sides 15 is a cross member 17 which is Vdesira'bly adjustable longitudinally of said side bars. rlhis cross bar functions .after the fashion of a rule and it has along its upper and lower portions, scales as 18 and 19 graduated as may be desired. Its ends are somewhat forked, the branches of the forks 20 yieldingly straddling the respective side bars 15 so that the cross member or rule 17 may be readily applied to or moved from the side bars. One flange of each of these clips 21 'is a trifle longer than the other one so as to insure proper hold of the clips upon the side bars. The scaled member 17 has slidable on itsl upper side as shown 'the clip 22, the upper side of the clip fitting flatwise against the top of the transverse or scaled member 17 and the branches or channels 23 in the sides of the scaled member near the lower surface thereof to thus prevent accidental displacement of the clip, yet when desired it vcan be readily removed or applied.

From the upper side of the clip 22 the Y stud or pin 24 extends and has threaded to it the nut 25. This clip 22 constitutes a suitable supporting device or carrier for a prothe lnner section 27 tractor such as that denoted in a general way by 26. The protractor 26 as shown involves an inner section as 27 and an outer section as 28, the two portions being riveted or otherwise suitably united to each other. The outer'or main section 28 of the protractor 26 has at its upper end the clip support 29 which overlies the rule 30 functioning as a straight edge and which fits latwise against of the protractor, it being movable longitudinally of the protractor. It receives within it springs 31 attached at their butts 'to the protractor section .28 and the' free portion of which fits a longitudinal channel 32 in the upper scaled member 30 to guide the upper scale 30. The upper and lower Sides on the outer face of the rule have graduations as 33. The upp scaled mem'ber 30 is constantly at practically right angles to the body of the protractor 26 although as we have observed, it can be readily moved endwise. The scaled member 30 is generally at a constant angle to the protractor-36 and the graduations on the protractor are of such nature as to coincide at all times with the center-line on the scaled member 17. By loosening the nut 25, the protractor 26 can be moved to any position upon the scaled member 17 and can be held in -an adjusted position by tightening the nut.

The scaled member 17 can as will be understood 'be readily moved along both side bars 15 for their complete length and both scales 18 and 19 on it can 'be used as well as 'the scale on the lsid'e bar 15 at the left in Fig. 1. The

protractor 26 can be used throughout the complete circle, so that maximum eiiiciency is insured. To facilitate the engagement of the holding down or clamping member 8 the lower cross bar 16 may as shown in Fig. 9 have its lower face roughened or corrugated, as at 16a.

In Fig. 8 We have shown the holding down member of'slightly modified construction. In this event, the transverse member 16 at the llower end is longitudinally adjustable of the side bars or rods 15 and it may be held in an adjusted position by a set screw thereby adapting the structure to pads or books of various depths. In this view Fig. 8) the pad or book is denoted by 2 and the base or foundation member by 3. In Fig. 12, the sca-led member equivalent so far as manner scales is concerned, vof the scaled member 17. Its body is removably associated with clips as 20 which longitudinally slide on the side bars 15 of a holding down member. The pad is denoted by 2". The body of the scaled member 17" is detachably associable with the members 20 and can be held removably associated therewith as by screws so that whenthe scaled member 17 and the adjunct supported thereby is reof using the means for yieldingly moved from the members 20, the same can be used as a unit in drafting or engineering work.

The center-line of the scaled member 17 is intended to coincide with gradua-tions on one of the side bars of the holding down member 8. In the illustration made in Fig. 1, this side bar is the one at the left. Jn the modification shown in Fig. 12, the scaled member 17 has the member 2Q at the right. It will be understood that this scaled member 17 has centrally of its exposed surface a centerline Wihich is intended to cooperate with a scale on the opposite side of the holding down member of which the side bar 15 is a part. n

We wish to note the fact tha-t the resilient flange 7 can be adjusted to conform to the dep-th of the book or pad by reason of the fact that the strip in quest-ion can be adjusted toward or from the base or foundation member 3.

. What we claim is: t

1. An appliance of the class described, comprising a'foundation member to sustain an article 4to receive lines, bearing members supported at the upper side of the foundation member, a holding down member, and forcing the holding down member against the article, a strip connected with the bearing members, and a flange connected with the strip, to overlie the article.

2. An appliance of the class described, comprising a foundation member to sustain an article to receive llnes, yoke-like bearing members, the lower branches of which are attached to the foundation member, blocks supported between the branches of the beharing members, screws carried by the bearing members and threaded through the blocks, for adjusting the same, a shaft extending through the blocks, a yoke-like holding down member for the article, connected with'the extended ends of the shaft, and springs around said extended shaft ends, connected respectively with the blocks and with said holding down member. l

3. An appliance of the class described, comprising a foundation member to sustain an article to receive lines, yoke-like bearing members, the lower branches of which are attached to the foundation member, blocks supported between the anges of the bearing members, screws carried by the upper branches of the respective bearing members and threaded through the bloclzs, ing the same, guide pins carried by the respective bearing members and extending freely through the respective blocks, a shaft extending through the blocks, a yoke-like holding down member for the article, having heads connected with the extended ends of said shaft, and coiled springs around said extended shaft ends, connected respectively for adjust- 7 with the blocks and with said holding down member.

4. An appliance of the class described comprising a foundation member to sustain an article to receive lines, yoke-like bearing members, the lower branches of which are attached to the foundation members, blocks supported between the branches of the bear! ing members, screws carried by the upper Hanges of the respective bearing members and threaded through the blocks, for adjusting the same, guide pins carried by the respective bearing members and extending through the blocks', a yoke-like holding down memberfor the article, having heads connected with the extended ends of said shaft, coiled springs around said extended shaft ends, connected respectively withv the blocks and with said holding down member, a.

strip connected with the inner side of the bearing members, and a resilient flange associated with the strip, to overlie the article.

5. An appliance of the class described comprising a foundation member to sustain an article to receive lines, bearing members supported by the foundation member, a holding down member sustained by the bearing members, means for yieldingly forcing the holding down member against the article, and protractor means carried by the holding down member.

6. An appliance of the class described, comprising a foundation member to sustain an article to receive lines', bearing members supported at the upper corners of the foundation member, a holding down member sustained at the upper corners of the bearing members, means for yieldingly forcing the holding down member against the article, and protractor means adjustably movable on the holding down member.

7. An appliance of the class described, comprising a scaled member, a clip to slidingly straddle the scaled member, a stud rising from the clip, a securing device associated with the stud, a protractor adjustably turnable on said stud as a pivot. and a scaled member longitudinally adjustably supported by the protractor.

8. An appliance of the character described, comprising a scaled member, a clip to slidingly straddle the scaled member, a stud ris'- ing from the clip, a nut threaded on the stud, a protractor tuinable on said stud as a pivot and held in an adjusted position by said nut, and a scaled member longitudinally adjustably supported by the protractor.

9. An appliance of the character described, comprisingv a scaled member, a' clip to slidingly straddle the scaled member, a stud rising from'the clip, a nut threaded on the stud, a protractor turnable on said stud as a pivot and held in an adjusted position by said nut, and a scaled member longitudinally adjustably supported by the protractor, the second scaled gitudinal channel an the prom-actor and 5 l0. An appliance scribed, comprising to sustain an article t members supported a 10 tending between the fitted member having a lond a spring carried by into the channel. of the character dea foundation member o receive lines, bearin t the upper side of the foundation member and a, resilient flange exbearlng members to overlie the article,

ment toward ber.

In testimon signatures.

yevwhereof We hereby aiiix our TIMOTHY J. SULLIVAN.

WILLIAM J. SULLIVAN.

Witnesses ELIN C'. GARDEIL,

ATH

SUTHERIAND. 

